What can I do if the Line Sensor has Problems Detecting Media?

1Excessive ink deposits on the drive8roller surface can fool the sensor by reflecting the light. ￿lean the drive8roller ' ￿hapter 9.

2Line sensor incorrectly calibrated: The accuracy calibration includes calibration of the line sensor on the carriage. You must use ￿P Matte film when performing the accuracy calibration (￿etails ' ￿hapter ￿).

Otherwise the line sensor will have problems loading some types of media.

3The Line Sensor is faulty. Replace the ￿arriage Assembly ' page 8837.

What can I do if the Carriage is Noisy?

1￿irty ￿arriage bushings. Remove dust particles from the ￿arriage bushings and from the slider rod along which the ￿arriage moves. If necessary, apply lubricant to the slider rod.

2Make sure that the belt is correctly positioned on the Y8axis motor.

3Remove dust particles from the Back Beam and, if necessary, apply grease.

4￿heck for a faulty ￿arriage. Perform the ￿arriage Axis Test ' page 4810.

What can I do if the Cover Sensor isn't Working?

￿h￿ ￿￿￿￿￿ ￿￿n￿￿￿ i￿ ￿￿￿￿ ￿￿ ￿h￿ ￿￿￿n￿￿￿￿n￿￿ ￿￿￿￿￿￿￿￿￿

1 Before troubleshooting, make sure that you are not in Service Mode 1 because the ￿over sensor is disabled and Printer will think that the cover is always closed. Power OFF the Printer and switch it back ON again and check if the ￿over sensor works.

2￿heck if the cable for the front8panel assembly is connected correctly to the electronics module.

3Replace the front8panel assembly ' page 8812.

What can I do if the Carriage Assembly has problems parking in the Service Station?

1Mispositioned trailing cable: The trailing cable may be preventing the carriage from reaching the left8hand stop. Make sure that the trailing cable is positioned under the plastic tabs at the back of the carriage cover, and not above them.

2The ￿arriage is not at the correct height. ￿heck and, if necessary, adjust the ￿arriage height (￿etails ' chapter ￿).

3The Belt is not correctly positioned over the idler pulley.

4￿heck for a faulty bail lever mechanism because the ￿arriage may have trouble passing over it.

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HP DesignJet 430, 450C and 455CA Printers

Troubleshooting